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Main Title Visibility in the Northeast : long-term visibility trends and visibility/pollutant relationships /
Author Trijonis, John. ; Husar, R. B. ; Yuan, Kung
Other Authors
Author Title of a Work
Yuan, Kung,
CORP Author Washington Univ., St. Louis, MO. ;Technology Service Corp., Santa Monica, CA.;Environmental Sciences Research Lab., Research Triangle Park, NC.
Publisher Environmental Sciences Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency ; Available through the National Technical Information Service],
Year Published 1978
Report Number EPA-600/3-78-075; EPA-803896
Stock Number PB-286 921
OCLC Number 05237070
Subjects Visibility--Northeastern States ; Air quality--Northeastern States ; Meteorology in aeronautics--Northeastern States ; Air quality ; Meteorology in aeronautics ; Visibility ; Northeastern States
Additional Subjects Air pollution ; Visibility ; Aerosols ; Trends ; Mathematical models ; Concentration(Composition) ; Sulfates ; Particles ; Northeast Region(United States)
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJAD  EPA 600/3-78-075 Region 3 Library/Philadelphia, PA 04/02/1993
EKBD  EPA-600/3-78-075 Research Triangle Park Library/RTP, NC 08/30/2010
ELBD ARCHIVE EPA 600-3-78-075 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ESAD  EPA 600-3-78-075 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-286 921 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation viii, 86 p. : ill. ; 28 cm.
The historical data base pertinent to visibility in the Northeast is analyzed. The data base includes approximately 25 years of airport visibility observations and more than 10 years of NASN particulate measurements. The investigation covers existing visibility levels, long-term trends in visibility, and visibility/pollutant relationships. Visibility in the Northeast is rather poor, median visual range being on the order of 10 miles. Visibility is not now substantially better in nonurban areas than in metropolitan areas of the Northeast. From the middle 1950's to the early 1970's, visibility exhibited only slight trends in large metropolitan areas but decreased on the order of 10 to 40% at suburban and nonurban locations. Over the same period, visual range declined remarkably during the third calendar quarter relative to other seasons, making the summer now the worst season for visibility. The decrease in visibility during the summer was especially notable at suburban and nonurban locations, where atmospheric extinction apparently increased on the order of 50 to 150% during the third calendar quarter. Regression models based on daily variations in visibility and pollutant concentrations indicate that sulfate aerosol is the single major contributor to haze in the Northeast. Sulfates apparently account for approximately 50% of total extinction.
Includes bibliographical references (p. 83-85).